But now this queen becomes annoying. Carlsen has managed to equalize comfortably.
13. c2d3 And the players enter a reversed Najdorf pawn structure. 13... f6h5 Quite a natural move. 14. e3g5 White is trying to provoke a concession. 14... g7f6  15. g5f6 Nepomniachtchi is happy to deprive his opponent of his bishop pair.